Light ???

kmog33

kmog33

Well-Known Member
ttystikk said:
Show me a better, more cost effective way to add UVB to my spectrum than T5. PLEASE. Until then, I'm kinda stuck with them.
Click to expand...
I'm going to throw some uv LEDs in one of my panels. Not cheap it's like $30 per 5 watt diode. But in theory they should last a while yeah? The question is how much uv is needed for a 3x3 and how long do I have to run them to make it worth paying so much for.


Sent from my iPhone using Tapatalk
 
Slipup420

Slipup420

Member
RM3 said:
hours and hours of research
Click to expand...
Hey did you know if you smoke crack and blow it on plants the plants metabolic rate increaes 1000 percent ??? i could show you a 2 week seedling that looks like 2 months old ....
As i get crack heads coming over and blowing on plants
Not only that THC levels increases 400 percent ,,, So i guess my new strain Super Ga Ga
is a Centurion cross of a Synthetic x hybrid cross crack cocaine x ??

Does this make sense to you ?

Would like to see scientific Data from you research ?? Does elevation cause anything , Do yuo have to pour the boiling water on north side or south side of the plant ??
West or maybe east side..
Now i have read some pretty fucked up things on what people do but boiling water tops it all Geez
 
Last edited:
ttystikk

ttystikk

Well-Known Member
kmog33 said:
I'm going to throw some uv LEDs in one of my panels. Not cheap it's like $30 per 5 watt diode. But in theory they should last a while yeah? The question is how much uv is needed for a 3x3 and how long do I have to run them to make it worth paying so much for.


Sent from my iPhone using Tapatalk
Click to expand...
I haven't seen good UV LED options. Do you have some in mind?
 
kmog33

kmog33

Well-Known Member
ttystikk

ttystikk

Well-Known Member
kmog33 said:
Digikey has a bunch uv diodes 1v, 3v and 5v diodes for $30-40.

http://www.digikey.com/product-detail/en/led-engin-inc/LZ1-10UV00-0000/1537-1032-ND/4976722
http://www.digikey.com/product-detail/en/led-engin-inc/LZ1-00UV00-0000/1537-1092-1-ND/4976782

Just a couple on digikey a search. Definitely have to do more research on which would be best.


Sent from my iPhone using Tapatalk
Click to expand...
Indeed. I'd like to see the spectrum graphs of these options, for starters. Thanks for this list!
 
kmog33

kmog33

Well-Known Member
ttystikk said:
Indeed. I'd like to see the spectrum graphs of these options, for starters. Thanks for this list!
Click to expand...
No problem. They're a bit pricey but if I could spend a couple hundred bucks on ir and uv diodes to add to my cobs, the benefits may be worth it. Worst case I can think of, negligible increase in potency/quality etc. Best case I have better quality flowers in less time with added yield. Lol. I've spent more money on worse ideas.


Sent from my iPhone using Tapatalk
 
whitebb2727

whitebb2727

Well-Known Member
kmog33 said:
I'm going to throw some uv LEDs in one of my panels. Not cheap it's like $30 per 5 watt diode. But in theory they should last a while yeah? The question is how much uv is needed for a 3x3 and how long do I have to run them to make it worth paying so much for.


Sent from my iPhone using Tapatalk
Click to expand...
Use the chart for the pure uv bulb from agromax. It gives you the amount of UV up to four foot away. It will give you a baseline and you can figure from there.

I run the one bulb the whole time my fixture is in from seed. Rm3 does the same.

Its new ground and we may not have an answer for you. You may have to be the guinea pig.
 
kmog33

kmog33

Well-Known Member
whitebb2727 said:
Use the chart for the pure uv bulb from agromax. It gives you the amount of UV up to four foot away. It will give you a baseline and you can figure from there.

I run the one bulb the whole time my fixture is in from seed. Rm3 does the same.

Its new ground and we may not have an answer for you. You may have to be the guinea pig.
Click to expand...
You have a link by chance? I appreciate the info. :).


Sent from my iPhone using Tapatalk
 
whitebb2727

whitebb2727

Well-Known Member
Slipup420 said:
Hey did you know if you smoke crack and blow it on plants the plants metabolic rate increaes 1000 percent ??? i could show you a 2 week seedling that looks like 2 months old ....
As i get crack heads coming over and blowing on plants
Not only that THC levels increases 400 percent ,,, So i guess my new strain Super Ga Ga
is a Centurion cross of a Synthetic x hybrid cross crack cocaine x ??

Does this make sense to you ?

Would like to see scientific Data from you research ?? Does elevation cause anything , Do yuo have to pour the boiling water on north side or south side of the plant ??
West or maybe east side..
Now i have read some pretty fucked up things on what people do but boiling water tops it all Geez
Click to expand...
How does a new member wonder in here and get involved in this silliness?

I suspect a sock.

Can you show us a pic of some good looking weed?
 
whitebb2727

whitebb2727

Well-Known Member
kmog33 said:
Thank you sir.


Sent from my iPhone using Tapatalk
Click to expand...
You're welcome.

Those links may not provide all the info needed but it gives you the micro watts cm2 at different distances.

I'm not sure how to go about it from there. Maybe take the info for the 5w led and see how many are needed.

I suspect it will still require some trial and error.
 
kmog33

kmog33

Well-Known Member
whitebb2727 said:
You're welcome.

Those links may not provide all the info needed but it gives you the micro watts cm2 at different distances.

I'm not sure how to go about it from there. Maybe take the info for the 5w led and see bow many are needed.

I suspect it will still require some trial and error.
Click to expand...
Agreed, I think the only way to actually figure out the benefits will be testing it. There isn't enough data on the uv diodes in general, much less whether they are effective in horticultural practice haha.

It's nice to have somewhere to start though and those sheets give me a couple ideas.


Sent from my iPhone using Tapatalk
 
kmog33

kmog33

Well-Known Member
Fortunately it looks like a relatively small amount of it would be more than sufficient in a closed environment.


Sent from my iPhone using Tapatalk
 
Doogan

Doogan

Well-Known Member
Experimenting with different light sources in veg and bloom. From T5 to DE.

T5-During Veg, like many other growers, T5 lighting works great and can have slightly varied colors, (Blue/Red). Efficient and cheap. During bloom the T5 was fully capable go producing decent buds. The problem that was noticed was the buds were smaller overall and if the light was not positioned properly the plants would stretch causing other issues and deficiencies.

MH-IMO they are more than necessary for veg growth. Using a hood and ballast for each MH light can be cumbersome whereas the T5 lighting fixtures almost all have the ballast built into the unit. Using a MH 600W in bloom as a supplementary light to 600W HPS did not do enough to warrant another run with MH.

MH/DE-Currently on the first test run of MHDE in Veg. 1000W AD/DE MH. 6' spread. Light is much more intense than any T5 or standard/CMH. Using on larger plants in a "pre-flower" set-up. Kevin Jodrey has talked about using high intensity lighting during vegetative growth for many reasons. Wether it is a DEMH, iGrow, induction, LEP... he says that the high intensity, full spectra, vegetative light allows the plants to built up the epidural, chloroplast layers and duraplasts. This helps with genetic drift and the overall vigor of the plant. The UVb light is essential to keep the plant at full vigor. Nothing can beat natural sunlight.

LED- Currently running in Vegetative growth from seed to pre-flower. In the past used for Bloom. Kind L300, full. Worked as well as T5 in bloom but with better turpines. Using it now for veg growth for first full experimental run.

Standard/HPS- Have run 400W and 600W in vertical and top light systems. 600W was used in vert and produced large volumes and works well for limited plant numbers and to maximize your yield per plant. "Top light" with OG vert reflector 600W produced excellent results. Great for smaller rooms.

DE HPS- By far the best used so far. All around higher yields, smells, flavor, resin... Used both ACDE and DE with 1000W. Both work great. Each has its pros and cons. The BOSS hoods are not air cooled and have a lower anchor point for shorter rooms (4" or so). With good A/C the room won't get that hot without AC hood. They also come without the glass, which by some standards can help with about 10% increase light intensity ~. Subsystem ACDE has a taller anchor point since the electrical input is on top. They are AC so heat intensity is reduced. A 3 foot distance is recommended but with some strains it can be too intense.
 
Sativied

Sativied

Well-Known Member
ttystikk said:
I'd like to see the spectrum graphs of these options, for starters.
Click to expand...
Hehe... spectrum graph of 365nm...

Anyway, @kmog33, those leds are UV A only. UV-A can help plants become stronger, synthesize more chlorophyll (and caretenoids...) but it's UV-B that increases the concentration of UV-B absorbing compounds. Which is where the quality potential lies:

image.png

kmog33 said:
much less whether they are effective in horticultural practice haha.
Click to expand...
There's actually quite a bit of recent research on the effect UV has on plants. Specifically the holes in the ozon layer motivated researchers to see how that may/will affect our food production and plants in nature in general. Adding -"cannabis" to google searches filters out most of the nonsense.

"Sensitivity to UV-B irradiation includes any morphological, physiological or biochemical change induced by UV-B. Significant effects have been reported for about half of the 300 or so crop species and cultivars studied so far, but with some notable variation"
http://plantsinaction.science.uq.edu.au/edition1/?q=content/12-2-3-ultraviolet-radiation-and-plant-biology

"When plants are hit with ultraviolet light, this event triggers the plant's defense mechanisms. The plant then becomes more resistant to insect attacks as it releases 15 defense proteins. The ultraviolet light also affects message pathways that impact plant development, growth and metabolism, according to Washington State University. The ultraviolet light tricks the plant into thinking that it is wounded, which occurs when the plant is being feed on by insects."
http://www.gardenguides.com/132133-plants-ultraviolet-light.html

"Like most pharmacologically-active secondary metabolites of plants, THC in Cannabis is assumed to be involved in self-defense"

http://link.springer.com/article/10.1023/A:1020314706567
The effect of solar UV-B radiation on terpenes and biomass production in Grindelia chiloensis (Asteraceae)
"Exposure to UV-B radiation reduced whole plant biomass, plant height and leaf area, and increased leaf thickness and resin accumulation in Grindelia chiloensis. "

There's enough research to get a pretty good idea of the effects of UVA and UVB, and some lab tests that confirmed it for cannabis too. The hardest part is probably to find a good balance. I got some UVA from my mh but not UVB. It does results in some of the effects that can be contributed to UVA (but also blue...), but doesn't appear to increase frost level, probably from lacking the uvb.
 
kmog33

kmog33

Well-Known Member
Sativied said:
Hehe... spectrum graph of 365nm...

Anyway, @kmog33, those leds are UV A only. UV-A can help plants become stronger, synthesize more chlorophyll (and caretenoids...) but it's UV-B that increases the concentration of UV-B absorbing compounds. Which is where the quality potential lies:

View attachment 3700607

There's actually quite a bit of recent research on the effect UV has on plants. Specifically the holes in the ozon layer motivated researchers to see how that may/will affect our food production and plants in nature in general. Adding -"cannabis" to google searches filters out most of the nonsense.

"Sensitivity to UV-B irradiation includes any morphological, physiological or biochemical change induced by UV-B. Significant effects have been reported for about half of the 300 or so crop species and cultivars studied so far, but with some notable variation"
http://plantsinaction.science.uq.edu.au/edition1/?q=content/12-2-3-ultraviolet-radiation-and-plant-biology

"When plants are hit with ultraviolet light, this event triggers the plant's defense mechanisms. The plant then becomes more resistant to insect attacks as it releases 15 defense proteins. The ultraviolet light also affects message pathways that impact plant development, growth and metabolism, according to Washington State University. The ultraviolet light tricks the plant into thinking that it is wounded, which occurs when the plant is being feed on by insects."
http://www.gardenguides.com/132133-plants-ultraviolet-light.html

"Like most pharmacologically-active secondary metabolites of plants, THC in Cannabis is assumed to be involved in self-defense"

http://link.springer.com/article/10.1023/A:1020314706567
The effect of solar UV-B radiation on terpenes and biomass production in Grindelia chiloensis (Asteraceae)
"Exposure to UV-B radiation reduced whole plant biomass, plant height and leaf area, and increased leaf thickness and resin accumulation in Grindelia chiloensis. "

There's enough research to get a pretty good idea of the effects of UVA and UVB, and some lab tests that confirmed it for cannabis too. The hardest part is probably to find a good balance. I got some UVA from my mh but not UVB. It does results in some of the effects that can be contributed to UVA (but also blue...), but doesn't appear to increase frost level, probably from lacking the uvb.
Click to expand...
Thanks for the info. I wasn't speaking of the effect of uv in practice, I was referring specifically to whether the diodes I found will be worthwhile in a horticultural setting.

The spectrum graph of a 365nm mono I also thought was a funny sentiment. I have to keep looking then for some uv b diodes as well then. Maybe 12-15 watts of uv a and 12-15 watts of uvb In a 3x3 should be enough to at least test effects (from the data whitebb provided) in my environment.


Sent from my iPhone using Tapatalk
 
Sativied

Sativied

Well-Known Member
kmog33 said:
Thanks for the info. I wasn't speaking of the effect of uv in practice, I was referring specifically to whether the diodes I found will be worthwhile in a horticultural setting.
Click to expand...
Ah I see... I know some flower greenhouses here in NL do use UV to intensify colors and others to reduce pesticide (I think it was UVC against botrytis/budrot) and that use of UV is referenced in led studies but haven't see those or other uv leds specified yet, I think it's still tubes in practice.

I think investing in UVB instead of UVA (hardens plants basically) can be much more effective in terms of results, final product.

Another good article:
http://onlinelibrary.wiley.com/store/10.1002/opph.201400048/asset/34_ftp.pdf

It is specifically low levels of UVB that can change and increase production of secondary metabolites, which include cannabinoids, flavonoids and terpenes. In a study of the uni of Wageningen they suggest the increase in secondary metabolites can be useful for growing "herbs".

Introduction to secondary metabolites in cannabis:
https://openaccess.leidenuniv.nl/bitstream/handle/1887/13206/01.pdf

Too high levels can have the opposite effect so I think starting with that 12-15 uvb on 3x3 is not a bad idea. Maybe even put it on a separate timer, or pulses...
 
You must log in or register to reply here.
Top